libgui: Add wb_platform_api_improvements flag

This flag will be used for the first set of changes to ConsumerBase and
Surface in support of Camera refactors related to go/warren-buffers.

Bug: 340933794
Flag: EXEMPT adding new flag
Test: n/a
Change-Id: I9e29f03c970967013a67ff6bd22d395ef75d88d8
diff --git a/libs/gui/libgui_flags.aconfig b/libs/gui/libgui_flags.aconfig
index 792966f..2d70052 100644
--- a/libs/gui/libgui_flags.aconfig
+++ b/libs/gui/libgui_flags.aconfig
@@ -35,3 +35,11 @@
     purpose: PURPOSE_BUGFIX
   }
 } # trace_frame_rate_override
+
+flag {
+  name: "wb_platform_api_improvements"
+  namespace: "core_graphics"
+  description: "Simple improvements to Surface and ConsumerBase classes"
+  bug: "340933794"
+  is_fixed_read_only: true
+} # wb_platform_api_improvements